I mounted mine above the rear vision mirror:
https://www.aulro.com/afvb/images/im...009/07/547.jpg
Bent up an aluminium bracket... it uses the same holes as the plasic map pockets up there (I just used longer screw). Riveted this bracket to the radio cradle.
Bit of a bugger running the coax up the pillar... but not too bad..
The one negative is on really rough terrain... the mike jumps out of it's holder - usually at the most inconvienient time...
And when it hit's Mrs Bytemrk..... we all get to share the pain. :(
Mark

